SPring-8 Seminar (第206回)
副題/演題 | Recent ARPES and RIXS developments at the Advanced Light Source: Topological insulator interfaces and high resolution copper M-Edge RIXS |
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開催期間 | 2011年08月16日15時00分から16時30分まで |
開催場所 | 上坪講堂 |
主催 | (財)高輝度光科学研究センター(JASRI) |
形式 | |
概要 |
Speaker : Dr. Lewis Andrew Wray Language : English Affiliate : Lawrence Berkeley National Laboratory Title : Recent ARPES and RIXS developments at the Advanced Light Source: Topological insulator interfaces and high resolution copper M-Edge RIXS Abstract : Topological insulators are a recently discovered class of semiconductors with bulk topological order that causes a wide range of unusual surface properties, such as the appearance of a nanometer thick shell of spin-helical Dirac electronic states. Our ARPES measurements demonstrate how topological order can be induced through chemical alloying in BiTl(S1-δSeδ)2, and show that when topological insulators are interfaced with normal metallic layers, they manifest novel classes of semiconductor junction behavior. The Advanced Light Source MERLIN RIXS beamline (4.0.3) is currently under commissioning, and will soon be open to general users for resonant inelastic X-ray scattering experiments. I will discuss new scientific explorations that are expected to be possible with the system, including preliminary data obtained during the commissioning period on cuprate samples. Because very few previous studies have been performed at the M-Edge, we will devote time to discussing how M-Edge scattering data at MERLIN resemble and differ from the more broadly studied transition metal K- and L-edges, including critical parameters of the excitation process such as fitted intermediate state lifetimes, X-ray penetration depth, spin-orbit coupling and scattering intensity for different types of excitation mode. 担当者 : 石井 賢司 |
問い合わせ先 |
JASRI 研究調整部 研究業務課 SPring-8セミナー事務局
垣口 伸二、小野村 和幸 0791-58-0949 0791-58-0988 spring8_seminar@spring8.or.jp |